translator fixes related to links, literals, and titles

[wncm]

1. Turn off escaping when inside of inline literals, same as with

block literals

2. Strip only whitespaces in visit_desc_signature (sometimes it would strip a part of the signature - reproduced with autodoc classes).
3. _refuri2http should be able to process links consisting of only the anchor (refid), like #some-title-on-the-same-page. Before this fix it would return an empty string as a URL.
4. Add an option to insert anchors for every signature, right above the title.